On Wednesday 14 July 2010 19:20:09, Ben Wise wrote:
Folks,
I'm trying to work through Conrad Barski's Haskell tutorial, http://www.lisperati.com/haskell/, and I've run into a difficult package problem. I've googled around for two days, but nothing seems to work.
Basically, I can not get it recognize matchRegex, mkRegex, and similar. They are all in the Text.Regex.Posix package,
hoogle and hayoo think they're not in regex-posix but in regex-compat
and version 0.94.1 is installed according to 'cabal list regex'. The 'import Text.Regex.Posix' line compiles just fine, so it is finding the package: it just doesn't find the symbols in it ?!
But (under all four combinations of command line ghc or Leksah on Windows 7 or Ubuntu), it keeps trying to use the 'base' version, not posix.
Text.Regex.Posix imports and re-exports Text.Regex.Base, so if you're using Text.Regex.Posix, you're *also* using regex-base.
At least, that's what 'ghc -v main.hs'
add --make
seems to be saying. In Leksah, adding some of the suggested build dependencies fixed earlier problems with importing the Text and Random things, but adding 'regex-compat' as suggested did not help.
Has anyone else gotten CB's tutorial to work?
Any suggestions as to how to get Text.Regex.Posix imported?